[Webkit-unassigned] [Bug 173770] New: [WPE] Add env var WPE_USE_HEADLESS_VIEW_BACKEND

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=173770

            Bug ID: 173770
           Summary: [WPE] Add env var WPE_USE_HEADLESS_VIEW_BACKEND
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit WPE
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cgarcia at igalia.com
                CC: bugs-noreply at webkitgtk.org

To automatically create the views with the headless view backend. Right now the headless view backend is only used by WTR using WKViewCreateWithViewBackend. However, we want to use the headless backend to run the unit tests too. We still don't have glib API to create a WebKitWebView with a custom WPE view backend, and even in that case, using a different webkit_web_view_new function in the tests would require adding ifdefs in every single case since GTK+ doesn't have such AI, of course. Also, we would need to find a place to share the headless view backend implementation. Using an environment variable we can simply add a headless driver to webkitpy, used by default, that ensures the WPE_USE_HEADLESS_VIEW_BACKEND variable is present in the environment. Then, we can move the headless view backend to WKWPE and use it in the View constructor when no backend is given and the variable WPE_USE_HEADLESS_VIEW_BACKEND is present and enabled. This will make unit tests work automatically once we add run-wpe-tests scripts, and also allows to run the layout tests in X11 without having to unset environment variables.

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